Refer to the following discussion: https://supportforums.cisco.com/discussion/11649866/error-message-nbrupdsizetoobig
"it's essentially a method to manage a group of switches without the need to assign an IP address to every switch"
Here is a document describing more about it: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-2900-xl-series-switches/4085-61.html
Apparently you can remove it and you will cease getting these error messages.
-Tyson